固定位置添加变量的方法

LR_IROM1 0x08000000 0x00080000  {    ; load region size_region

  ER_IROM1 0x08000000 0x00080000  {  ; load address = execution address
   *.o (RESET, +First)
   *(InRoot$$Sections)
   .ANY (+RO)
  }

   ER_IROM2 0x08040000 FIXED{

	*.o(EE_FLASH)
  }
  RW_IRAM1 0x20000000 0x00020000  {  ; RW data
   .ANY (+RW +ZI)
  }
;  RW_IRAM2 0x10000000 0x00010000  {
;   .ANY (ccmram)
;  }
  ER 0x10000000 0x00010000{
  .ANY (ccmram)
  }
}

u16 __attribute__ ((section ("EE_FLASH"))) Read_Encryption(void)
{
}

#define CCMRAM  __attribute__((section("ccmram")))  //使用ccm内存 内核高速内存 无法dma  可以定义函数在这个区域
CCMRAM volatile u16 udp_port;

const u16 hd_arm_id[3] __attribute__((at(0x08003400))) = {0xFFFF,0xFFFF,0xFFFF};

ENTRY(Reset_Handler)

/* Highest address of the user mode stack */
_estack = 0x20020000;    /* end of RAM */
/* Generate a link error if heap and stack don't fit into RAM */
_Min_Heap_Size = 0x200;      /* required amount of heap  */
_Min_Stack_Size = 0x400; /* required amount of stack */

/* Specify the memory areas */
MEMORY
{
RAM (xrw)      : ORIGIN = 0x20000000, LENGTH = 128K
CCMRAM (xrw)      : ORIGIN = 0x10000000, LENGTH = 64K
BACKRAM (xrw)   :ORIGIN = 0x40024000, LENGTH = 4
FLASH (rx)      : ORIGIN = 0x8020000, LENGTH = 128K*3
SCRIPT_FLASH (rx) : ORIGIN = 0x8010000, LENGTH = 64K
}

_Privileged_Functions_Region_Size = 16K;
_Privileged_Data_Region_Size = 256;
__FLASH_segment_start__ = ORIGIN( FLASH );
__FLASH_segment_end__ = __FLASH_segment_start__ + LENGTH( FLASH );
__privileged_functions_start__ = ORIGIN( FLASH );
__privileged_functions_end__ = __privileged_functions_start__ + _Privileged_Functions_Region_Size;
__SRAM_segment_start__ = ORIGIN( RAM );
__SRAM_segment_end__ = __SRAM_segment_start__ + LENGTH( RAM );
__privileged_data_start__ = ORIGIN( RAM );
__privileged_data_end__ = ORIGIN( RAM ) + _Privileged_Data_Region_Size;

/* Define output sections */
SECTIONS
{
  /* The startup code goes first into FLASH */
  .isr_vector :
  {
    . = ALIGN(4);
    KEEP(*(.isr_vector)) /* Startup code */
    . = ALIGN(4);
  } >FLASH

  /* The program code and other data goes into FLASH */
  .text :
  {
    . = ALIGN(4);
    *(.text)           /* .text sections (code) */
    *(.text*)          /* .text* sections (code) */
    *(.glue_7)         /* glue arm to thumb code */
    *(.glue_7t)        /* glue thumb to arm code */
    *(.eh_frame)

    KEEP (*(.init))
    KEEP (*(.fini))

    . = ALIGN(4);
    _etext = .;        /* define a global symbols at end of code */
  } >FLASH

  /* Constant data goes into FLASH */
  .rodata :
  {
    . = ALIGN(4);
    *(.rodata)         /* .rodata sections (constants, strings, etc.) */
    *(.rodata*)        /* .rodata* sections (constants, strings, etc.) */
    . = ALIGN(4);
  } >FLASH

  .ARM.extab   : { *(.ARM.extab* .gnu.linkonce.armextab.*) } >FLASH
  .ARM : {
    __exidx_start = .;
    *(.ARM.exidx*)
    __exidx_end = .;
  } >FLASH

  .preinit_array     :
  {
    PROVIDE_HIDDEN (__preinit_array_start = .);
    KEEP (*(.preinit_array*))
    PROVIDE_HIDDEN (__preinit_array_end = .);
  } >FLASH
  .init_array :
  {
    PROVIDE_HIDDEN (__init_array_start = .);
    KEEP (*(SORT(.init_array.*)))
    KEEP (*(.init_array*))
    PROVIDE_HIDDEN (__init_array_end = .);
  } >FLASH
  .fini_array :
  {
    PROVIDE_HIDDEN (__fini_array_start = .);
    KEEP (*(SORT(.fini_array.*)))
    KEEP (*(.fini_array*))
    PROVIDE_HIDDEN (__fini_array_end = .);
  } >FLASH

  .script_flash_table :
  {
    . = ALIGN(4);
    *(.script_flash_table)         /* .rodata sections (constants, strings, etc.) */
    *(.script_flash_table*)        /* .rodata* sections (constants, strings, etc.) */
    . = ALIGN(4);
  } >SCRIPT_FLASH

  /* used by the startup to initialize data */
  _sidata = LOADADDR(.data);

  /* Initialized data sections goes into RAM, load LMA copy after code */
  .data :
  {
    . = ALIGN(4);
    _sdata = .;        /* create a global symbol at data start */
    *(.data)           /* .data sections */
    *(.data*)          /* .data* sections */

    . = ALIGN(4);
    _edata = .;        /* define a global symbol at data end */
  } >RAM AT> FLASH

  _siccmram = LOADADDR(.ccmram);

  /* CCM-RAM section
  *
  * IMPORTANT NOTE!
  * If initialized variables will be placed in this section,
  * the startup code needs to be modified to copy the init-values.
  */
  .ccmram :
  {
    . = ALIGN(4);
    _sccmram = .;       /* create a global symbol at ccmram start */
    *(.ccmram)
    *(.ccmram*)

    . = ALIGN(4);
    _eccmram = .;       /* create a global symbol at ccmram end */
  } >CCMRAM AT> FLASH

    .backram :
  {
    . = ALIGN(4);
    _sbackram = .;       /* create a global symbol at ccmram start */
    *(.backram)
    *(.backram*)

    . = ALIGN(4);
    _ebackram = .;       /* create a global symbol at ccmram end */
  } >BACKRAM AT> FLASH


  /* Uninitialized data section */
  . = ALIGN(4);
  .bss :
  {
    /* This is used by the startup in order to initialize the .bss secion */
    _sbss = .;         /* define a global symbol at bss start */
    __bss_start__ = _sbss;
    *(.bss)
    *(.bss*)
    *(COMMON)

    . = ALIGN(4);
    _ebss = .;         /* define a global symbol at bss end */
    __bss_end__ = _ebss;
  } >RAM

  /* User_heap_stack section, used to check that there is enough RAM left */
  ._user_heap_stack :
  {
    . = ALIGN(8);
    PROVIDE ( end = . );
    PROVIDE ( _end = . );
    . = . + _Min_Heap_Size;
    . = . + _Min_Stack_Size;
    . = ALIGN(8);
  } >RAM



  /* Remove information from the standard libraries */
  /DISCARD/ :
  {
    libc.a ( * )
    libm.a ( * )
    libgcc.a ( * )
  }

  .ARM.attributes 0 : { *(.ARM.attributes) }
}

1
#define USE_CCMRAM __attribute__((section(".ccmram")))
2
#define USE_BACKRAM __attribute__((section(".backram")))
3
#define USE_SCRIPT_FLASH __attribute__((section(".script_flash_table")))
4
USE_CCMRAM StepMotorRunStruct Motor_Run[MOTOR_NUB];

CopyCCMRAMInit:
  ldr  r3, =_siccmram
  ldr  r3, [r3, r1]
  str  r3, [r0, r1]
  adds  r1, r1, #4
LoopCopyCCMRAMInit:
  ldr  r0, =_sccmram
  ldr  r3, =_eccmram
  adds  r2, r0, r1
  cmp  r2, r3
  bcc  CopyCCMRAMInit